The Worcester 87170100620 3-Way Valve is a genuine replacement hydraulic control component designed to manage the direction of heated water flow within your boiler system. In applications where a boiler serves both central heating and domestic hot water (DHW), this valve acts as a diverter, switching water between the heating circuit and the hot-water side depending on demand. By correctly directing flow, it helps ensure rapid hot-water delivery when taps are opened and smooth, balanced heating distribution when space heating is required.

A properly functioning 3-way valve helps reduce noise, improves response times and prevents unwanted heat distribution, while a worn, seized or malfunctioning valve can lead to poor heat switching, delayed hot-water response or boiler fault codes. Replacing it with the correct OEM part restores reliable hydraulic control.

This 3-way valve is compatible with Worcester and Worcester Bosch boilers that reference part number 87170100620 in their technical documentation. To ensure correct fitment and dependable operation, always verify that the part number matches your existing valve or consult your boiler’s service information before installation, as valve designs and connection interfaces can vary between models and system configurations.

Supplied ready for direct replacement, the 87170100620 3-Way Valve installs into the boiler’s hydraulic circuit and integrates with existing actuators and pipework when fitted by a qualified engineer. Choosing this genuine Worcester Bosch component helps restore accurate flow direction, supports efficient heat delivery and contributes to dependable boiler performance.